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Introduction to database learning

This year, I came across the website phpstudy on the recommendation of a colleague. I feel that it really supp...

From [MySQLdiscussion group] 2020-06-02 21:24:33 0  0  1103

Mysql has been unable to start, and there is no port occupation. What is the situation?

From [MySQLdiscussion group] 2017-08-31 11:00:50 0  1  1100

mysql optimization - How to create an index using mysql fuzzy query and order by?

For example, there is a mysql statement like this: {code...} How to create an index for such a sql statement. ...

From [MySQLdiscussion group] 2017-06-14 10:50:40 0  1  1100

MySQL 字段默認值 一般設null 還是空字符串？

MySQL 字段默認值 一般設null 還是空字符串？設nul 和空字符串的區(qū)別是什么，各有什么優(yōu)缺點。

From [MySQLdiscussion group] 2017-04-17 14:39:43 0  3  1099

mysql - Query the unique values ??of a certain field in the database, sorted by time, how to write it?

The article model is as follows class Article(models.Model): {code...} Query: If there are multiple pieces of ...

From [MySQLdiscussion group] 2017-06-20 10:05:37 0  1  1098

mysql - How to restore tables from .idb files backed up by Alibaba Cloud

How to restore tables from Alibaba Cloud's .idb file.

From [MySQLdiscussion group] 2017-06-12 09:22:27 0  1  1097

MAX(CONVERT(column, TIME(3))) returns different values ??from mysql client than JPA native query

The value returned by MAX(CONVERT(column,TIME(3))) from the mysql client is different from the value returned ...

From [MySQLdiscussion group] 2023-09-16 12:15:25 0  1  1096

java - Online application, what should be done if the database operation fails?

I would like to ask for advice on online application. If the database operation (insert, update, delete) fails...

From [MySQLdiscussion group] 2017-06-28 09:23:37 0  4  1092

Mysql slow query log content viewing problem

The slow query log is enabled in mysql, but I often see such a query in the log. I don’t know what it means. I...

From [MySQLdiscussion group] 2017-06-28 09:23:21 0  2  1091

php - The third-party payment platform notifies multiple times asynchronously in a short period of time, and the order is confirmed and collected multiple times.

The third-party payment asynchronous notification notifies the callback address multiple times. The previous n...

From [MySQLdiscussion group] 2017-05-25 15:08:25 0  4  1091

php - sql查詢結(jié)果合并的問題

如何將meta_key 為10086和12580的結(jié)果查詢合并成一條 我嘗試了這種，但結(jié)果還是分開（group by 之后結(jié)果會丟失） 問題補充：我想查詢出來的結(jié)果如下

From [MySQLdiscussion group] 2017-04-17 16:52:29 0  3  1090

Update using multiple JOINs in MySQL/Python

The first set of questions were deemed too similar to another post (it wasn't) and were closed... so I've made...

From [MySQLdiscussion group] 2023-09-12 21:19:12 0  1  1089

mysql 哪個版本穩(wěn)定好用

之前使用版本5.1.30，如下， {代碼...} 有個致命的問題：主從備份無法設定備份時間，只能實時 根據(jù)評論更新選擇：5.1.30： 不選擇，沒有定時備份功能，就是主從的時候，必須實時的。想定時不行 5.5.18： 理...

From [MySQLdiscussion group] 2017-04-17 13:39:24 0  5  1089

Warning: mysqli_error() expects **Xiaobai's solution

<?php $conn=mysqli_connect("localhost","root","123456789") or die("Datab...

From [MySQLdiscussion group] 2020-08-26 16:10:59 0  0  1086

When you enter the mysql database under cmd, you can enter Chinese, but when viewing the table information, Chinese is not displayed. What's going on?

Enter the mysql database under cmd, and you can enter Chinese, but when viewing the table information, Chinese...

From [MySQLdiscussion group] 2018-10-13 15:25:42 0  0  1086